Eames had been released from a hospital order weeks before the attack and had stopped taking his prescribed medication.

When police arrived at the front door, the 41-year-old answered it to them and said: “He’s upstairs, he’s dead, I killed him and he deserved it.”

Michael Auty QC, prosecuting, said the killing took place at a terraced house Eames and Mr Pennick, 31, had only been sharing for a matter of days in Allen Street.

He said their next door neighbour returned home from work and “suddenly heard a loud thud” coming from next door.

Mr Auty said: “Ten minutes later there was a knock at the door. It was the defendant and the following conversation took place:

“He said to the neighbour ‘all right, mate? Can you ring the police?’.

“The neighbour asked ‘what for?’ and the defendant replied ‘I think I have stabbed someone, I stabbed him three times to the neck.’.”

Mr Auty said the neighbour called the police who arrived at Eames’ house and knocked at the door.

He said: “The defendant answered the door and calmly said to the officers ‘he’s upstairs, he’s dead, I have killed him he deserved it’.

“’I am calm, he stole from me, he rushed into my room and I just flipped.

“’I hit him a few times and then stabbed him in the neck’.”

In today’s hearing, at Nottingham Crown Court, Mr Auty said that three of the officers went upstairs and found Mr Pennick lying unconscious on the landing having suffered stab wounds to his face and neck.

They attempted CPR until paramedics arrived to take him to hospital but he was declared dead around an hour later.

A post mortem examination result revealed he suffered three deep stab wounds and a number of other knife injuries.

Mr Auty told the court how Eames had received surgery to remove a brain tumour as a nine-year-old which caused “a real change in him leading to him becoming aggressive”.

He said Eames had been previously diagnosed with paranoid schizophrenia and also had a history of taking class A drugs.

He told the court Eames had been released from a hospital order weeks before he attacked Mr Pennick and had stopped taking his prescribed medication.

In his interview, Eames was played the body cam footage from when police went inside the Allen Street address and “did not seek to dispute” his full admission to being responsible for the killing.

Eames pleaded guilty to manslaughter on the grounds of diminished responsibility when he appeared at the same court at a hearing in August.

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Alwyn Jones QC, for Eames, said his client had been seen and assessed by two separate consultant psychiatrists who had both concluded how he was suffering from psychoactive psychosis at the time he killed Mr Pennick.

Mr Jones said: “They both express the view that his mental disorder significantly contributed to the defendant doing what he did on that day.

“He wants the public gallery to know he had no premeditation to attack Mr Pennick and wishes to apologise to those affected for his actions on that day.”

Judge Gregory Dickinson QC, Honorary Recorder of Nottingham, adjourned the hearing while he assessed information he had heard from the prosecution and defence and from consultant psychiatrists who assessed Eames.

One of them, Dr Phillip Joseph, who is based at St Mary’s Hospital in Paddington, London, was asked by Mr Auty to assess the level of culpability Eames had for the killing.

Dr Joseph said the brain damage Eames suffered as a nine-year-old when he underwent surgery for a brain tumour had led to him to become more aggressive.

He said: “The manslaughter is largely attributable to that brain damage.

“His violence stems from that untreatable brain damage and therefore the risk (to the public) remains.

“We are dealing with a risky individual who is dangerous for the foreseeable future.

“Therefore we need to look at what is the best way to manage him because his aggression comes out of the blue almost.

“His dangerousness is still there and even if his psychosis is treated successfully he will remain a risk.

“Should he remain in a secure unity for the rest of his life? It is difficult to judge.

“I would be worried if he was out on the streets in the next five years.”

Eames then shouted from the dock: “I got angry because he (Mr Pennick) stole from me.”